The year the minimum wage law went into effect was the last year the unemployment rate of blacks was lower than that for whites.
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...In 1930, black unemployment was a full percentage point lower than whites, even in a time of more racism. The reason was that blacks were barred from union membership, so could more easily underbid unionized whites for jobs. Even in the post-bellum South, 80% of low-skilled laborers were black. The Davis-Bacon Act, the first federal legislation on minimum wages, was specifically intended by its drafters to restrict blacks from federal construction contracts, which they had previously dominated. The subsequent Wagner Act and other New Deal legislation further shut out blacks from trades. 1930 was the last year that black unemployment was lower than whites. In 2011, twice as many blacks are unemployed as whites, as a percentage of population.